- Physics & Mathematics ## Physicists unveil the most accurate atomic clock ever ‪—‬ and it could literally redefine the second Physicists have used radioactive lutetium to create what they say is the most accurate atomic clock ever, keeping time perfectly up to 19 decimal places. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. - Copy link - Facebook - Reddit - Pinterest - Flipboard Scientists have created the most accurate atomic clock ever made ‪—‬ and it could literally redefine the second. Researchers recently unveiled the…